1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * sm3_base.h - core logic for SM3 implementations
4 *
5 * Copyright (C) 2017 ARM Limited or its affiliates.
6 * Written by Gilad Ben-Yossef <gilad@benyossef.com>
7 */
8
9 #ifndef _CRYPTO_SM3_BASE_H
10 #define _CRYPTO_SM3_BASE_H
11
12 #include <crypto/internal/hash.h>
13 #include <crypto/sm3.h>
14 #include <linux/crypto.h>
15 #include <linux/module.h>
16 #include <linux/string.h>
17 #include <asm/unaligned.h>
18
19 typedef void (sm3_block_fn)(struct sm3_state *sst, u8 const *src, int blocks);
20
21 static inline int sm3_base_init(struct shash_desc *desc)
22 {
23 struct sm3_state *sctx = shash_desc_ctx(desc);
24
25 sctx->state[0] = SM3_IVA;
26 sctx->state[1] = SM3_IVB;
27 sctx->state[2] = SM3_IVC;
28 sctx->state[3] = SM3_IVD;
29 sctx->state[4] = SM3_IVE;
30 sctx->state[5] = SM3_IVF;
31 sctx->state[6] = SM3_IVG;
32 sctx->state[7] = SM3_IVH;
33 sctx->count = 0;
34
35 return 0;
36 }
37
38 static inline int sm3_base_do_update(struct shash_desc *desc,
39 const u8 *data,
40 unsigned int len,
41 sm3_block_fn *block_fn)
42 {
43 struct sm3_state *sctx = shash_desc_ctx(desc);
44 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
45
46 sctx->count += len;
47
48 if (unlikely((partial + len) >= SM3_BLOCK_SIZE)) {
49 int blocks;
50
51 if (partial) {
52 int p = SM3_BLOCK_SIZE - partial;
53
54 memcpy(sctx->buffer + partial, data, p);
55 data += p;
56 len -= p;
57
58 block_fn(sctx, sctx->buffer, 1);
59 }
60
61 blocks = len / SM3_BLOCK_SIZE;
62 len %= SM3_BLOCK_SIZE;
63
64 if (blocks) {
65 block_fn(sctx, data, blocks);
66 data += blocks * SM3_BLOCK_SIZE;
67 }
68 partial = 0;
69 }
70 if (len)
71 memcpy(sctx->buffer + partial, data, len);
72
73 return 0;
74 }
75
76 static inline int sm3_base_do_finalize(struct shash_desc *desc,
77 sm3_block_fn *block_fn)
78 {
79 const int bit_offset = SM3_BLOCK_SIZE - sizeof(__be64);
80 struct sm3_state *sctx = shash_desc_ctx(desc);
81 __be64 *bits = (__be64 *)(sctx->buffer + bit_offset);
82 unsigned int partial = sctx->count % SM3_BLOCK_SIZE;
83
84 sctx->buffer[partial++] = 0x80;
85 if (partial > bit_offset) {
86 memset(sctx->buffer + partial, 0x0, SM3_BLOCK_SIZE - partial);
87 partial = 0;
88
89 block_fn(sctx, sctx->buffer, 1);
90 }
91
92 memset(sctx->buffer + partial, 0x0, bit_offset - partial);
93 *bits = cpu_to_be64(sctx->count << 3);
94 block_fn(sctx, sctx->buffer, 1);
95
96 return 0;
97 }
98
99 static inline int sm3_base_finish(struct shash_desc *desc, u8 *out)
100 {
101 struct sm3_state *sctx = shash_desc_ctx(desc);
102 __be32 *digest = (__be32 *)out;
103 int i;
104
105 for (i = 0; i < SM3_DIGEST_SIZE / sizeof(__be32); i++)
106 put_unaligned_be32(sctx->state[i], digest++);
107
108 memzero_explicit(sctx, sizeof(*sctx));
109 return 0;
110 }
111
112 #endif /* _CRYPTO_SM3_BASE_H */
113
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